Shower unit



FIG. 1 is a front perspective view of a shower unit showing my design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines in the drawings represent unclaimed portions of the design and form no part thereof. 

The ornamental design for a shower unit, as shown and described. 